/**
 * Entities.js
 *
 * Released under LGPL License.
 * Copyright (c) 1999-2017 Ephox Corp. All rights reserved
 *
 * License: http://www.tinymce.com/license
 * Contributing: http://www.tinymce.com/contributing
 */

/*jshint bitwise:false */
/*eslint no-bitwise:0 */

/**
 * Entity encoder class.
 *
 * @class tinymce.html.Entities
 * @static
 * @version 3.4
 */
define(
  'tinymce.core.html.Entities',
  [
    "tinymce.core.util.Tools"
  ],
  function (Tools) {
    var makeMap = Tools.makeMap;

    var namedEntities, baseEntities, reverseEntities,
      attrsCharsRegExp = /[&<>\"\u0060\u007E-\uD7FF\uE000-\uFFEF]|[\uD800-\uDBFF][\uDC00-\uDFFF]/g,
      textCharsRegExp = /[<>&\u007E-\uD7FF\uE000-\uFFEF]|[\uD800-\uDBFF][\uDC00-\uDFFF]/g,
      rawCharsRegExp = /[<>&\"\']/g,
      entityRegExp = /&#([a-z0-9]+);?|&([a-z0-9]+);/gi,
      asciiMap = {
        128: "\u20AC", 130: "\u201A", 131: "\u0192", 132: "\u201E", 133: "\u2026", 134: "\u2020",
        135: "\u2021", 136: "\u02C6", 137: "\u2030", 138: "\u0160", 139: "\u2039", 140: "\u0152",
        142: "\u017D", 145: "\u2018", 146: "\u2019", 147: "\u201C", 148: "\u201D", 149: "\u2022",
        150: "\u2013", 151: "\u2014", 152: "\u02DC", 153: "\u2122", 154: "\u0161", 155: "\u203A",
        156: "\u0153", 158: "\u017E", 159: "\u0178"
      };

    // Raw entities
    baseEntities = {
      '\"': '&quot;', // Needs to be escaped since the YUI compressor would otherwise break the code
      "'": '&#39;',
      '<': '&lt;',
      '>': '&gt;',
      '&': '&amp;',
      '\u0060': '&#96;'
    };

    // Reverse lookup table for raw entities
    reverseEntities = {
      '&lt;': '<',
      '&gt;': '>',
      '&amp;': '&',
      '&quot;': '"',
      '&apos;': "'"
    };

    // Decodes text by using the browser
    function nativeDecode(text) {
      var elm;

      elm = document.createElement("div");
      elm.innerHTML = text;

      return elm.textContent || elm.innerText || text;
    }

    // Build a two way lookup table for the entities
    function buildEntitiesLookup(items, radix) {
      var i, chr, entity, lookup = {};

      if (items) {
        items = items.split(',');
        radix = radix || 10;

        // Build entities lookup table
        for (i = 0; i < items.length; i += 2) {
          chr = String.fromCharCode(parseInt(items[i], radix));

          // Only add non base entities
          if (!baseEntities[chr]) {
            entity = '&' + items[i + 1] + ';';
            lookup[chr] = entity;
            lookup[entity] = chr;
          }
        }

        return lookup;
      }
    }

    // Unpack entities lookup where the numbers are in radix 32 to reduce the size
    namedEntities = buildEntitiesLookup(
      '50,nbsp,51,iexcl,52,cent,53,pound,54,curren,55,yen,56,brvbar,57,sect,58,uml,59,copy,' +
      '5a,ordf,5b,laquo,5c,not,5d,shy,5e,reg,5f,macr,5g,deg,5h,plusmn,5i,sup2,5j,sup3,5k,acute,' +
      '5l,micro,5m,para,5n,middot,5o,cedil,5p,sup1,5q,ordm,5r,raquo,5s,frac14,5t,frac12,5u,frac34,' +
      '5v,iquest,60,Agrave,61,Aacute,62,Acirc,63,Atilde,64,Auml,65,Aring,66,AElig,67,Ccedil,' +
      '68,Egrave,69,Eacute,6a,Ecirc,6b,Euml,6c,Igrave,6d,Iacute,6e,Icirc,6f,Iuml,6g,ETH,6h,Ntilde,' +
      '6i,Ograve,6j,Oacute,6k,Ocirc,6l,Otilde,6m,Ouml,6n,times,6o,Oslash,6p,Ugrave,6q,Uacute,' +
      '6r,Ucirc,6s,Uuml,6t,Yacute,6u,THORN,6v,szlig,70,agrave,71,aacute,72,acirc,73,atilde,74,auml,' +
      '75,aring,76,aelig,77,ccedil,78,egrave,79,eacute,7a,ecirc,7b,euml,7c,igrave,7d,iacute,7e,icirc,' +
      '7f,iuml,7g,eth,7h,ntilde,7i,ograve,7j,oacute,7k,ocirc,7l,otilde,7m,ouml,7n,divide,7o,oslash,' +
      '7p,ugrave,7q,uacute,7r,ucirc,7s,uuml,7t,yacute,7u,thorn,7v,yuml,ci,fnof,sh,Alpha,si,Beta,' +
      'sj,Gamma,sk,Delta,sl,Epsilon,sm,Zeta,sn,Eta,so,Theta,sp,Iota,sq,Kappa,sr,Lambda,ss,Mu,' +
      'st,Nu,su,Xi,sv,Omicron,t0,Pi,t1,Rho,t3,Sigma,t4,Tau,t5,Upsilon,t6,Phi,t7,Chi,t8,Psi,' +
      't9,Omega,th,alpha,ti,beta,tj,gamma,tk,delta,tl,epsilon,tm,zeta,tn,eta,to,theta,tp,iota,' +
      'tq,kappa,tr,lambda,ts,mu,tt,nu,tu,xi,tv,omicron,u0,pi,u1,rho,u2,sigmaf,u3,sigma,u4,tau,' +
      'u5,upsilon,u6,phi,u7,chi,u8,psi,u9,omega,uh,thetasym,ui,upsih,um,piv,812,bull,816,hellip,' +
      '81i,prime,81j,Prime,81u,oline,824,frasl,88o,weierp,88h,image,88s,real,892,trade,89l,alefsym,' +
      '8cg,larr,8ch,uarr,8ci,rarr,8cj,darr,8ck,harr,8dl,crarr,8eg,lArr,8eh,uArr,8ei,rArr,8ej,dArr,' +
      '8ek,hArr,8g0,forall,8g2,part,8g3,exist,8g5,empty,8g7,nabla,8g8,isin,8g9,notin,8gb,ni,8gf,prod,' +
      '8gh,sum,8gi,minus,8gn,lowast,8gq,radic,8gt,prop,8gu,infin,8h0,ang,8h7,and,8h8,or,8h9,cap,8ha,cup,' +
      '8hb,int,8hk,there4,8hs,sim,8i5,cong,8i8,asymp,8j0,ne,8j1,equiv,8j4,le,8j5,ge,8k2,sub,8k3,sup,8k4,' +
      'nsub,8k6,sube,8k7,supe,8kl,oplus,8kn,otimes,8l5,perp,8m5,sdot,8o8,lceil,8o9,rceil,8oa,lfloor,8ob,' +
      'rfloor,8p9,lang,8pa,rang,9ea,loz,9j0,spades,9j3,clubs,9j5,hearts,9j6,diams,ai,OElig,aj,oelig,b0,' +
      'Scaron,b1,scaron,bo,Yuml,m6,circ,ms,tilde,802,ensp,803,emsp,809,thinsp,80c,zwnj,80d,zwj,80e,lrm,' +
      '80f,rlm,80j,ndash,80k,mdash,80o,lsquo,80p,rsquo,80q,sbquo,80s,ldquo,80t,rdquo,80u,bdquo,810,dagger,' +
      '811,Dagger,81g,permil,81p,lsaquo,81q,rsaquo,85c,euro', 32);

    var Entities = {
      /**
       * Encodes the specified string using raw entities. This means only the required XML base entities will be encoded.
       *
       * @method encodeRaw
       * @param {String} text Text to encode.
       * @param {Boolean} attr Optional flag to specify if the text is attribute contents.
       * @return {String} Entity encoded text.
       */
      encodeRaw: function (text, attr) {
        return text.replace(attr ? attrsCharsRegExp : textCharsRegExp, function (chr) {
          return baseEntities[chr] || chr;
        });
      },

      /**
       * Encoded the specified text with both the attributes and text entities. This function will produce larger text contents
       * since it doesn't know if the context is within a attribute or text node. This was added for compatibility
       * and is exposed as the DOMUtils.encode function.
       *
       * @method encodeAllRaw
       * @param {String} text Text to encode.
       * @return {String} Entity encoded text.
       */
      encodeAllRaw: function (text) {
        return ('' + text).replace(rawCharsRegExp, function (chr) {
          return baseEntities[chr] || chr;
        });
      },

      /**
       * Encodes the specified string using numeric entities. The core entities will be
       * encoded as named ones but all non lower ascii characters will be encoded into numeric entities.
       *
       * @method encodeNumeric
       * @param {String} text Text to encode.
       * @param {Boolean} attr Optional flag to specify if the text is attribute contents.
       * @return {String} Entity encoded text.
       */
      encodeNumeric: function (text, attr) {
        return text.replace(attr ? attrsCharsRegExp : textCharsRegExp, function (chr) {
          // Multi byte sequence convert it to a single entity
          if (chr.length > 1) {
            return '&#' + (((chr.charCodeAt(0) - 0xD800) * 0x400) + (chr.charCodeAt(1) - 0xDC00) + 0x10000) + ';';
          }

          return baseEntities[chr] || '&#' + chr.charCodeAt(0) + ';';
        });
      },

      /**
       * Encodes the specified string using named entities. The core entities will be encoded
       * as named ones but all non lower ascii characters will be encoded into named entities.
       *
       * @method encodeNamed
       * @param {String} text Text to encode.
       * @param {Boolean} attr Optional flag to specify if the text is attribute contents.
       * @param {Object} entities Optional parameter with entities to use.
       * @return {String} Entity encoded text.
       */
      encodeNamed: function (text, attr, entities) {
        entities = entities || namedEntities;

        return text.replace(attr ? attrsCharsRegExp : textCharsRegExp, function (chr) {
          return baseEntities[chr] || entities[chr] || chr;
        });
      },

      /**
       * Returns an encode function based on the name(s) and it's optional entities.
       *
       * @method getEncodeFunc
       * @param {String} name Comma separated list of encoders for example named,numeric.
       * @param {String} entities Optional parameter with entities to use instead of the built in set.
       * @return {function} Encode function to be used.
       */
      getEncodeFunc: function (name, entities) {
        entities = buildEntitiesLookup(entities) || namedEntities;

        function encodeNamedAndNumeric(text, attr) {
          return text.replace(attr ? attrsCharsRegExp : textCharsRegExp, function (chr) {
            if (baseEntities[chr] !== undefined) {
              return baseEntities[chr];
            }

            if (entities[chr] !== undefined) {
              return entities[chr];
            }

            // Convert multi-byte sequences to a single entity.
            if (chr.length > 1) {
              return '&#' + (((chr.charCodeAt(0) - 0xD800) * 0x400) + (chr.charCodeAt(1) - 0xDC00) + 0x10000) + ';';
            }

            return '&#' + chr.charCodeAt(0) + ';';
          });
        }

        function encodeCustomNamed(text, attr) {
          return Entities.encodeNamed(text, attr, entities);
        }

        // Replace + with , to be compatible with previous TinyMCE versions
        name = makeMap(name.replace(/\+/g, ','));

        // Named and numeric encoder
        if (name.named && name.numeric) {
          return encodeNamedAndNumeric;
        }

        // Named encoder
        if (name.named) {
          // Custom names
          if (entities) {
            return encodeCustomNamed;
          }

          return Entities.encodeNamed;
        }

        // Numeric
        if (name.numeric) {
          return Entities.encodeNumeric;
        }

        // Raw encoder
        return Entities.encodeRaw;
      },

      /**
       * Decodes the specified string, this will replace entities with raw UTF characters.
       *
       * @method decode
       * @param {String} text Text to entity decode.
       * @return {String} Entity decoded string.
       */
      decode: function (text) {
        return text.replace(entityRegExp, function (all, numeric) {
          if (numeric) {
            if (numeric.charAt(0).toLowerCase() === 'x') {
              numeric = parseInt(numeric.substr(1), 16);
            } else {
              numeric = parseInt(numeric, 10);
            }

            // Support upper UTF
            if (numeric > 0xFFFF) {
              numeric -= 0x10000;

              return String.fromCharCode(0xD800 + (numeric >> 10), 0xDC00 + (numeric & 0x3FF));
            }

            return asciiMap[numeric] || String.fromCharCode(numeric);
          }

          return reverseEntities[all] || namedEntities[all] || nativeDecode(all);
        });
      }
    };

    return Entities;
  }
);
